shell 脚本 ssh 命令退出状态 [英] shell script ssh command exit status

问题描述

在 shell 脚本的循环中，我连接到各种服务器并运行一些命令.例如

In a loop in shell script, I am connecting to various servers and running some commands. For example

#!/bin/bash
FILENAME=$1
cat $FILENAME | while read HOST
do
   0</dev/null ssh $HOST 'echo password| sudo -S 
   echo $HOST 
   echo $?      
   pwd
   echo $?'
done

这里我正在运行echo $HOST"和pwd"命令，我通过echo $?"获得退出状态.

Here I am running "echo $HOST" and "pwd" commands and I am getting exit status via "echo $?".

我的问题是，我希望能够将远程运行的命令的退出状态存储在某个变量中，然后(根据命令是否成功)将日志写入本地文件.

My question is that I want to be able to store the exit status of the commands I run remotely in some variable and then ( based on if the command was success or not) , write a log to a local file.

感谢任何帮助和代码.

推荐答案

ssh 会以远程命令的退出码退出.例如:

ssh will exit with the exit code of the remote command. For example:

$ ssh localhost exit 10
$ echo $?
10

所以在您的 ssh 命令退出后，您可以简单地检查 $?.您需要确保没有掩盖您的返回值.例如，您的 ssh 命令以:

So after your ssh command exits, you can simply check $?. You need to make sure that you don't mask your return value. For example, your ssh command finishes up with:

echo $?

这将始终返回 0.您可能想要的是更像这样的:

This will always return 0. What you probably want is something more like this:

while read HOST; do
  echo $HOST
  if ssh $HOST 'somecommand' < /dev/null; then
    echo SUCCESS
  else
    echo FAIL
done

你也可以这样写:

while read HOST; do
  echo $HOST
  if ssh $HOST 'somecommand' < /dev/null
  if [ $? -eq 0 ]; then
    echo SUCCESS
  else
    echo FAIL
done

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